A61B5/7207—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal of noise induced by motion artifacts

A61B5/721—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal of noise induced by motion artifacts using a separate sensor to detect motion or using motion information derived from signals other than the physiological signal to be measured

A—HUMAN NECESSITIES

A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE

A61B—DIAGNOSIS; SURGERY; IDENTIFICATION

A61B5/00—Detecting, measuring or recording for diagnostic purposes; Identification of persons

Abstract

A heartrate detection method applicable in a headphone (100, 300, 500, and 700) and the headphone (100, 300, 500, and 700). The method comprises: (910) one cavity (110, 310, 510, and 710) is provided in the headphone (100, 300, 500, and 700), a microphone (120, 320, 520, and 720) is mounted within the cavity (110, 310, 510, and 710); also provided within the headphone (100, 300, 500, and 700) is an accelerometer (530 and 730); (920) when the headphone (100, 300, 500, and 700) is being worn, a signal produced by changes in the pressure in the cavity (110, 310, 510, and 710) is captured by the microphone (120, 320, 520, and 720), a signal produced by body movements of a wearer is captured by the accelerometer (530 and 730); (930) the signal captured by the accelerometer (530 and 730) is self-adaptively filtered to produce an estimation signal for a signal produced by the bodily movements of the wearer in the signal captured by the microphone (120, 320, 520, and 720); (940) the estimation signal is subtracted from the signal captured by the microphone (120, 320, 520, and 720) to acquire a heartrate-related signal; and, (950) heartrate is detected on the basis of the heartrate-related signal. The technical solution employs a closed cavity to accommodate the microphone (120, 320, 520, and 720), reduces interferences from external noises, enhances signal information collected by the microphone (120, 320, 520, and 720), self-adaptively filters the signal captured by the accelerometer (530 and 730) to produce the estimation signal, and subtracts the estimation signal from the signal captured by the microphone, and then detects the heartrate, thus eliminating impacts on heartrate detection due to bodily movements of the wearer.

Description

The heart rate detection method applied to the headset and the headset can detect heart rate FIELD

The present invention relates to a headset and heart rate detection technology, and particularly relates to a method for detecting heart rate is applied to the headset and the headset can detect heart rate.

Background technique

With the continuous development of social economy, people's living standards rising, people are increasingly concerned about their health. The heart rate detection will provide people with important information about health. Any display different from normal heart rate can indicate health problems, you can discover the heart rate by detecting whether our bodies there is a problem. Heart rate detection may also reflect people exercise intensity is appropriate, in order to get the best workout results, people in the course of exercise heart rate should be maintained within a certain range to some extent, while heart rate detector may be provided as a reasonable amount of motion an indicator.

In addition, many people in the process of movement, like listening to music with headphones, in order to be able to measured heart rate during exercise, and do not need to carry other equipment, people began to study how to use the headset technologies to detect heart rate.

Heart rate detection technology, in addition to the heart rate belt, and now emerging utilizing headphones to detect heart rate technology to achieve the purpose of accurate and convenient.

Use headphones to detect heart rate technology is only in recent years that appears. October 23, 2013 to 25, the health equipment development Yokohama, Japan, Kaiteki company and Bifrostec company exhibited a technique you can use headphones pulse measurement fluctuations. This technique utilizes a closed space formed in the ear canal close to the headset, since the vibration of the eardrum, would produce a certain pressure within the ear canal, and the pressure is changed with the change of the vibration, the change information collected with the microphone in the ear canal pressure, heart rate detected so as to achieve purpose. But the headset can not occupy the entire ear canal, can cause gas leaks inside the ear canal, resulting in less than a microphone to detect changes in pressure, and heart rate testing will be outside interference noise.

SUMMARY

In view of the above problems, the present invention is to overcome the above problems or to provide at least partially solve the problems of the heart rate detection method applied to headphones and headsets can detect heart rate.

The present invention provides a method of detecting the heart rate is applied to the headset, wherein the method comprises:

A cavity provided in the headset, the microphone is mounted within the cavity; said cavity opening and headphones shell bonding position, when the earpiece is attached to the human ear auricle bonded position of the earphone housing; headphones shell at the opening of the cavity with a hole bonded, when the headset is worn, and the ear cavity and the aperture bonded constitute a closed space;

When the headset is worn by the microphone signal acquired by the pressure changes within the cavity generated;

As the microphone signal acquired heart rate related signal;

Heart rate detection signal related to a heart rate.

Optionally, the method comprising: an acceleration sensor provided in the headset;

When the headset is worn, since the body motion signal generated by the wearer acquired by the acceleration sensor;

The acceleration sensor to capture a signal adaptive filtering process, to obtain an estimated signal due to body motion of the wearer of the generated microphone signals collected;

Collected from the microphone signal by subtracting the estimated signal to obtain a signal related to the heart rate.

The present invention also provides a method capable of detecting heart rate earphone, wherein the earphone comprising: heart beat detecting means, disposed in the cavity and a microphone mounted within said cavity earphone;

Wherein the shell with a headset port bonded position of the cavity is, when the earpiece is attached to the human ear auricle engagement position earphone shell; headphones shell at the opening of the cavity with a hole bonded , when the headset is worn, and the ear cavity and the aperture bonded constitute a closed space;

The microphone, when the earpiece is used to collect the signal within the cavity by the pressure variation generated; the microphone signal acquired as a heart rate related signal;

The heart rate detection unit for detecting the heart rate of a heart rate related signal.

The acceleration sensor is used when the headset is worn, since the body motion signal acquisition wearer generated and outputted to the adaptive filtering means;

The adaptive filtering means for adaptively filtering a signal related to a heart rate of said acceleration sensor acquired signal to obtain an estimated signal due to body motion of the wearer of the generated microphone signals collected after the output to the subtraction unit;

The subtraction unit, for acquiring a signal from the microphone to subtracting the estimated signal to obtain an output signal related to the heart rate to a heart rate detecting means and said adaptive filtering means.

Such a solution is seen from the above examples, embodiments of the present invention, uses a sealed chamber formed of a headphone body lumen to accommodate the microphone and the earphone housing, reduces outside interference noise and enhance the microphone signals collected information. Further added in the headset acceleration sensor for acquiring a signal due to the movement produced by the human body, and to eliminate the effect of exercise on the human body by the heart rate detection adaptive filter design.

The above description is only an overview of the technical solution of the present invention, in order to more fully understood from the present invention, but may be implemented in accordance with the contents of the specification, and in order to make the aforementioned and other objects, features and advantages of the present invention can be more fully understood , give the following features of the present invention is described embodiment.

BRIEF DESCRIPTION

1 a schematic view of the headset of FIG embodiment of a heart rate can be detected in the embodiment of the present invention;

2A is an embodiment there is provided a schematic side view of the embodiment of the cavity 110 of the headset 100 according to the present invention;

2B embodiment is provided as an embodiment of a schematic diagram of the back surface 110 of the cavity earphone 100 of the present invention;

FIG 2C is an embodiment there is provided the embodiment of the cavity 110 side sectional view of the earphone 100 according to the present invention;

Figure 3 still another embodiment, one kind of embodiment schematic view of the headset of the present invention is capable of detecting the heart rate;

FIG 4 is a flowchart of one embodiment is applied to heart rate detection method for an earphone embodiment of the invention;

FIG 5 is a schematic structure of an embodiment of the headset is capable of detecting the heart rate of the embodiment of the present invention;

FIG 6 is a schematic view of a mounting position of the acceleration sensor in an embodiment of the present invention;

Figure 7 is a schematic structure of a further invention embodiment is capable of detecting heart rate earphone embodiment;

FIG 8 is a schematic structural diagram of a general adaptive filter;

9 a flowchart of one embodiment is applied to heart rate detection method for an earphone embodiment of the invention.

Specific Example

The following exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. While the exemplary embodiment shows an exemplary embodiment of the present disclosure in the drawings, it should be understood that the present disclosure may be implemented embodiments and should not be set forth herein to limit in various forms. Rather, these embodiments are able to more thorough understanding of the present disclosure, and the scope of the present disclosure can be fully convey to those skilled in the art.

1 a schematic structural embodiment of an earphone heart rate can be detected in the embodiment of the present invention. 1, the earphone 100 can detect heart comprising: heart beat detecting means 140, disposed within the cavity 110 and the headset microphone is mounted within cavity 110, 120;

Wherein the position of the housing cavity with a headset port 110 is bonded, when the headphone is worn in the auricle of the human ear earphone shell bonded; headphones shell at the opening of the cavity 110 bonded hole, when the cavity and a hole constituting bonded auricle when the earphone is worn sealed space;

Signal from the microphone 120 for when the headset is worn by the pressure change in the cavity 110 generated by the collection;

Headphones can detect heart rate shown in FIG. 100, 110 provided in the small chamber 100 to accommodate the headset microphone 120, and can form a sealed space with the auricle, thereby reducing interference from external noise, and microphone style strengthen 120 to set the signal information.

In one embodiment of the present invention, the heart rate detection unit 140, a microphone for collecting period of the filtered signal is detected, a reciprocal of the period of the detected signal obtained heart rate.

In the conventional art earphone detection heart rate, typically a microphone placed directly in the ear canal of the headset CKS position for collecting the eardrum ear cavity pressure vibration generated change information, but one earphone and the ear canal because the space formed relatively large, will cause gas leaks inside the ear canal, making microphone acquisition of pressure change information is very weak, on the other hand often can not occupy the entire ear canal headphone, microphone directly on the headset, be subject to interference from external noise. Accordingly the present invention FIG designed headset microphone installed another embodiment shown in FIG. 1, reference can be made to FIG 2A-2C.

2A is an embodiment there is provided a schematic side view of the embodiment of the cavity 110 of the earphone 100 according to the present invention. The embodiment of the present invention, 2B is a setting example of a schematic diagram of the back surface 100 of the cavity 110 of the headset. FIG 2C is an embodiment there is provided the embodiment of the cavity 110 side sectional view of the earphone 100 according to the present invention. In order to better capture the useful signal, and heartbeats, the present invention designs a small cavity for placement of a microphone. Position a schematic cavity 2A and 2B, the range is shown by broken lines in FIG formed inside the earphone 110. Referring to FIG. 2C and the earphone housing chamber opening 110 bonded. As can be seen, in this embodiment, the cavity 110 is located proximate the edge portion of the headphone of the auricle, the earphone and the cavity in which the engagement portion has a thoughtful opening 111, when the headset is worn, the ear apertures 111 and close contact, so that the cavity 110 and the adhesion of the ear portion constituting a closed space. The microphone is mounted in the cavity 110, the stretching vibration auricle wall 110 causes the pressure changes in the chamber, the microphone will change information acquired pressure within the cavity 110, the information is reflected to some extent in the heart beat frequency, it is possible to detect the heart rate accordingly.

In physics, the hermetic space (without considering the temperature), pressure, and inversely proportional to the volume, the smaller the pressure that is larger, then acts on a certain area of ​​greater pressure. When the user headphones, form a closed space within the ear canal, since the pulse pressure fluctuations caused by the blood vessel wall contraction of the ear, it will produce a certain change in the pressure chamber, the pressure change signal will be detected by the microphone. Pulse Pressure fluctuations generally very weak blood vessels, the greater the confined space, the smaller the pressure change detected by the microphone, the microphone in order to increase the strength of the detected pressure variations, the microphone apparatus of the present embodiment in a closed small chamber the ear canal close to the small cavities, fluctuations due to the pulse pressure vessel wall contraction vibrations cause the ear, the microphone so that the vibration of the small cavity to detect a change in pressure. And the design of small cavities will reduce the effect of external interference signal.

Figure 3 a further embodiment of a schematic configuration of an earphone of a heart rate can be detected in the embodiment of the present invention. 3, the earphone 300 can detect heart comprising: a filtering unit 330, a heart rate detection unit 340, disposed within the cavity 310 and the headset microphone is mounted within cavity 310, 320;

Wherein the position of the mouth with the headset attached to the housing cavity 310 that, when the headphone is worn in the auricle of the human ear earphone shell bonded; headphones shell cavity 310 opening at the bonding hole, when the cavity and a hole constituting bonded auricle when the earphone is worn sealed space;

A microphone 320 for when the headset is worn, the signal from the pressure change in the generated collection chamber 310, and outputs a corresponding signal to the filtering unit 130;

Filtering unit 330, 320 configured to set style microphone signal is filtered, the resulting filtered signal is output to the heart rate detection unit 340. Here the filtering unit 320 of the microphone signals collected by filtering, to eliminate the influence of noise interference on heart rate detection.

A heart rate detecting means 340 for detecting heart rate in accordance with the filtered signal.

In one embodiment of the present invention, the heart rate detection unit 340, a periodic signal related to the heart rate is detected, a reciprocal of the period of the detected signal obtained heart rate. For example, a heart rate detection unit 340, can use the existing autocorrelation method, a method of detecting the threshold heart rate related signal period.

In one embodiment of the present invention, as shown in FIG. 3, the filtering unit 330 includes: a low pass filter for the signal from microphone 320 to collect low-pass filtering process to filter out high frequency interference signals. This is because a lower frequency vibration of the pulse (approximately 0.3Hz-3Hz), while the higher frequency external noise, according to this feature, it is possible to eliminate the influence of external high frequency noise by the low pass filter. For example, the low pass filter cut-off frequency may be selected as an FIR filter or the like of 5Hz.

The headset shown in Figure 3, using a low-pass filter the signal collected by the microphone low-pass filtering process. 3, the first with a small cavity pressure within the collection chamber microphone signal; and low-pass filtered signal of the low pass filter with the microphone collected; Finally, the obtained heart rate signal, can be detected heart rate. Heart beats with a certain periodicity, then the heart rate signal is a periodic signal having a constant, may be obtained corresponding to the signal period based on the autocorrelation method is the inverse of the period the heart rate.

After obtaining dL (n), according to the cyclical nature of the signal, it can be detected using the autocorrelation method, the threshold method and the like of its period, which period is the reciprocal of the heart rate.

It can be obtained by the embodiment of FIG. 1 or 3 as shown in FIG headset people in each case the heart rate (quiet, sports, etc.) in order to obtain health information body, or as a basis depending on the circumstances one may control their movement amount in a suitable range.

Heartbeat detection method is applied to the headphone of the present invention are given in the above embodiments.

FIG 4 is a flowchart of one embodiment is applied to heart rate detection method for an earphone embodiment of the invention. 4, the method comprising:

Step S410, the headset is disposed within a cavity, the microphone is mounted in the cavity; oral cavity earphone shell bonding position is the position when the earphone is worn bonded auricle of the human ear earphone housing; chamber headphones shell at the nozzle holes are bonded, ear when the earphone is worn with the bore cavity and bonded to constitute a sealed space;

Step S420, the when the headset is worn, the cavity comprising the microphone signal generated by the pressure changes in the collection;

Step S430, the heart rate is detected based on signals from the microphone collected. The heart rate signal as a signal related to the upcoming collection microphone, for detecting the heart rate based on a signal related to the heart rate.

In one embodiment of the present invention, the method shown in FIG. 4 further comprising before step 430: the microphone acquired signals is filtered to obtain the filtered signal. The step S430 includes detecting the heart rate signal of the microphone in accordance with the collected: heart rate detected based on the filtered signal.

In one embodiment of the filtering process of the present invention, the method shown in FIG. 4 for the microphone signals collected comprising: a microphone for collecting a signal to the low pass filtering process to filter out high frequency interference signals.

In one embodiment of the present invention, comprising a heart rate detecting filtered signal: periodic signal is detected after filtering by the reciprocal of the period of the detected signal obtained heart rate.

To sum up, the beneficial effects of the above embodiment of the present invention, the technical solution includes:

(1) a smaller volume enclosed cavity to accommodate the microphone, ambient noise is reduced, and strengthening the information signal detected by the microphone.

(2) According to the characteristic vibration frequency of the pulse, a low-pass filter is designed to further reduce the influence of external high frequency noise.

Headphones detect heart rate, there is an important factor in use, affecting accurate detection of heart rate, that is the human body movement. Since the human body movement inevitably causes vibration of the ear wall, the vibration will also cause changes in ear canal pressure, this pressure will also change the microphone to be collected, thereby interfering with the analysis of the heart rate signal. To this end, the present invention also gives the following solution.

FIG 5 is a schematic structure of an embodiment of the headset is capable of detecting the heart rate of the embodiment of the present invention. 5, the headset 500 can detect heart rate comprising: a subtracting unit 550, a heart rate detection unit 560, an acceleration sensor 530, the adaptive filtering unit 540, disposed within the chamber body 510 and the earphone is mounted within cavity 510 a microphone 520;

Wherein the position of the mouth of the cavity 510 and is bonded to the earphone housing, when the earpiece is attached to the human ear auricle engagement position earphone shell; headphones shell opening 510 of the cavity being bonded with an opening, when the auricle when the headphone is worn, and with the opening cavity constituting a closed space bonded.

A microphone 520 for when the headset 500 is worn, the pressure inside the collection chamber 510, and outputs the generated change signal to the subtraction unit 550.

An acceleration sensor 530 for when the headset is worn, since the body motion signal acquisition wearer generated and outputted to the adaptive filtering unit 540.

Adaptive filtering unit 540, the adaptive filtering process for carrying out a heart rate signal related to the acceleration sensor 530 acquired signal to obtain an estimated signal due to body motion of the wearer of the generated microphone signal 520 collected in the output 550 to the subtraction unit.

Estimating a signal subtraction unit 550, for acquiring a signal from the microphone to the adaptive filtering unit 540 subtracts the output signal to obtain an output related to the heart rate and a heartbeat detection unit 560, an adaptive filter unit 540.

5 of the acceleration sensor 530 detects a signal adaptive filtering process, so that the acceleration sensor 530 acquired from the body motion signal to accurately estimate the microphone 520 to the body motion signal acquisition, because the purpose of eliminating human body effect on heart rate detected motion. Microphone 520 and the acceleration sensor 530 will detect the signal due to the vibration generated by the human body movement, although the same period of two signals, but the amplitude will be different and therefore require filters to eliminate this difference, so that the body motion can be generated acceleration signals collected from the microphone signal to eliminate, to obtain a valid heart rate information.

FIG earphone can detect heart rate 500 shown in Figure 5, the headset 500 is provided within the cavity 510 to accommodate microphone 520, thereby reducing interference from external noise and reinforce the signal information collected by the microphone 520. In addition, the heart rate can be detected in the headset 500 of the acceleration sensor 530 is added to collect the signal produced by the motion of the wearer's body, the acceleration sensor 530 acquired signal adaptive filtering is subtracted from the signal adaptive filtering collected in the microphone after the acceleration sensor signal, then the heart rate detection, which eliminates the effect of exercise on the body of the wearer's heart rate detection.

In one embodiment of the present invention, the headphone shown in FIG. 5 further comprising a low pass filter for a microphone signal acquired low-pass filtering process, to obtain a low pass filtered signal is then output to the subtraction unit 550. I.e. estimation signal subtraction unit 550 for subtracting the output from the adaptive filtering unit 540 from the low pass filtered signal to obtain an output signal related to the heart rate detection unit heart rate. This is because a lower frequency vibration of the pulse (approximately 0.3Hz-3Hz), while the higher frequency external noise, according to this feature, it is possible to eliminate the influence of external high frequency noise by the low pass filter. For example, the low pass filter cut-off frequency may be selected as an FIR filter or the like of 5Hz.

Similar to that shown in cavity 510 and the microphone 510 mounted within the cavity 520 of the particular installation and Figures 2A-2C in the embodiment of the present invention, is provided in the headset 500 will not repeat here.

FIG 6 is a schematic view of a mounting position of the acceleration sensor in an embodiment of the present invention. Since the human body so that the body skin of the games along with vibration, the acceleration sensor device parts embodiment does not contact the skin in the headset of the present embodiment, in order to avoid affecting the skin vibration signals collected by the acceleration sensor, the acceleration sensor to improve the accuracy of the signal acquisition . Referring to Figure 6, the acceleration sensor 530 may be placed in any part of the dashed box of FIG. 6 illustrate the headset 500 shown in FIG.

In practice, even if the headset to occupy the entire ear canal, forming a completely closed chamber, the impact of exercise on the human body to detect the heart rate is inevitable. Because, the human body movement will inevitably lead to vibrations of the ear wall, the pressure changes within the chamber of this vibration is also detected by the microphone. So, microphone collected data includes not only because of the pressure pulse pressure vessels fluctuations change information, including both the pressure generated by the human body in motion change information within the ear canal. To eliminate the influence of the human body motion of the heart rate detection, the present invention is added in the headset acceleration sensor, the acceleration sensor device does not contact the part of the skin in the headset, such as headset position shown in the dashed box 6 shown in FIG. An acceleration sensor acceleration information collected human body movement produced. Change information within the human ear canal pressure generated by body motion and acceleration have the same oscillation frequency, can be used as a basis for the interference filter to eliminate certain movement of the human body produced.

According to previous analysis, if the signal from the microphone detected due to filter the signal produced by the human body movement, then we can get the ear canal due to blood flow caused by self-generated signal contraction, heart beat, and this signal frequency, this signal is obtained based on the heart rate information.

Collected into the ear canal microphone comprises a pressure caused by movement of the human body change information, the acceleration sensor is acceleration information acquired human body corresponding to the motion. Although both signals have the same oscillation frequency, i.e. the same periodicity, but the amplitude will be different, the signal can not be directly acquired from the microphone signal to remove, and therefore the present embodiment, since the person to filter by adaptive filtering method body movement generated interference.

As described above, the present embodiment: First, a smaller volume of hermetic chamber to accommodate the microphone, ambient noise is reduced, and strengthening the information signal detected by the microphone. Then, he added in the headset acceleration sensor for acquiring a signal due to the movement produced by the human body, and to eliminate the effect of exercise on the human body by the heart rate detection adaptive filter design. Further, according to the characteristics of the pulse oscillation frequency, the design of the low pass filter, to further reduce the influence of external noise. Example 7 below to be further described.

7 a further embodiment of a schematic configuration of an earphone of a heart rate can be detected in the embodiment of the present invention. As shown in FIG 7, the earphone 700 can detect heart comprising: a subtracting unit 750, a heart rate detection unit 760, a low pass filter 770, an acceleration sensor 730, the adaptive filtering unit 740, disposed within the cavity 710 and the earphone mounting within the cavity 710 of the microphone 720. Wherein the adaptive filtering unit 740 includes: a parameter tunable filter 741 and adaptive parameter adjustment unit 742.

Wherein the position of the mouth of the cavity 710 and is bonded to the earphone housing, when the earpiece is attached to the human ear auricle engagement position earphone shell; headphones shell at the opening of the cavity 710 has openings bonded, when the auricle when the headphone is worn, and with the opening cavity constituting a closed space bonded.

Microphone 720, a headset 700 is worn when the signal from the pressure changes in the collection chamber 710, and the generated output to a low pass filter 770.

A low pass filter 770, a microphone 720 for gathering signals to low-pass filtering process, to obtain a low pass filtered signal 750 and then output to the subtraction unit.

An acceleration sensor 730, when the earpiece is used, since the signal acquisition wearer's body motion, and outputs the generated parameter to the adaptive filtering unit 740 tunable filter 741 and adaptive parameter adjustment unit 742.

Parameters tunable filter 741, the acceleration sensor 730 for a signal adaptive filtering is performed using the acquired filtering parameters, since the estimation of the wearer signal generated by body motion to the subtraction unit 720 outputs the style microphone signal to set 750.

A subtraction unit 750 for subtracting the estimated signal parameters tunable filter 741 output from the signal output from the low pass filter to obtain an output signal related to a heart rate of heart rate detection unit 760; a subtraction unit 750, further for heart rate related signal to the adaptive parameter adjusting unit 742.

In one embodiment of the present invention, the heart rate detection unit 760, a periodic signal related to the heart rate is detected, a reciprocal of the period of the detected signal obtained heart rate. E.g., 760, can use the existing autocorrelation method, a method of detecting the threshold heart rate signal related to the period of the heartbeat detection unit.

FIG 8 is a general structural diagram of an adaptive filter. 8, mainly by the adaptive filter parameters and tunable filter coefficient of the adaptive filter parameter adjustment unit adjusting two parts. Adaptive filter design requires no prior knowledge of knowledge about the statistical properties of the signal, it can gradually "get it" or to estimate statistical characteristics required in the course of their work, and thus automatically adjust its parameters based on to achieve the best filtering effect. In FIG. 8, Ex (n) is the desired signal, In (n) is the input signal, Out (n) is the output signal, e (n) is the estimation error, e (n) = Ex (n) -Out (n) . The filter coefficients of the adaptive filter is controlled by the error signal, e (n) by a predetermined coefficient adjusting adaptive adaptive algorithm, such that the final e (n) the minimum mean square error, then the output signal of the best approximation of the desired signal.

Corresponding to the error signal (signal including heart rate). yL (n) and y1 (n) has a certain correlation can be suitably designed transfer function to that y1 (n) through an output signal y2 (n) after the filter approximation yL (n). For example according to the minimum mean square error, mean square of the error signal when the minimum expected value, the output signal y2 (n) may be used to estimate the effective yL (n), then it can interfere with the body-movement detecting the heart rate acquired from the microphone signal removal, remove disturbing signal again. After low-pass filtered microphone signal by subtracting the acceleration sensor signal after adaptive filtering, to obtain a signal related to the heart rate information, and

In order to detect heart rate basis. Heart beat with a certain periodicity, then

Is a certain periodic signal, corresponding to the inverse of the signal period, the period is the heart rate can be obtained based on the autocorrelation method.

y1 (n) and y (n) is the signal generated by the same movement, y1 (n) corresponds to the acceleration information, y (n) is the corresponding pressure information, while the two corresponding different amplitudes, but with the same vibration frequency. In order to y (n) from the elimination of x (n), select the adaptive filter (impulse response as h (n)) of y1 (n) is filtered to obtain y2 (n) = y1 (n) * h (n ), so that y2 (n) as close to x (n), after the low-pass filtering the human body due to the pressure generated by the movement change signal yL (n).

Such contraction of the ear canal due to the signals generated can be expressed as:

Parameter of the adaptive filter using an adaptive algorithm to obtain, adaptive algorithm many ways, such as minimum mean square error method may be employed, even to give

A filter coefficient obtained when the minimum value.

Obtained

After, according to the cyclical nature of the signal, it can be detected using the autocorrelation method, the threshold method and the like of its period, which period is the reciprocal of the heart rate.

Embodiment can be obtained by the headphone shown in FIG. 5 or FIG. 7 people in each case the heart rate (quiet, sports, etc.) in order to obtain state of health information, or as a basis for people depending on their particular circumstances controlling the amount of motion within a suitable range.

Given heartbeat detection method is applied to the headphone of the present invention based on the above embodiment, the method of the present invention in the specific contents of each step may be found in the relevant product description of embodiments of the present invention.

9 a flowchart of one embodiment is applied to heart rate detection method for an earphone embodiment of the invention. 9, the method comprising:

Step S910, the headset is disposed within a cavity, the microphone is mounted in the cavity; oral cavity earphone shell bonding position is the position when the earphone is worn bonded auricle of the human ear earphone housing; chamber headphones shell at the nozzle openings are bonded, ear when the earphone is worn with the cavity opening and constituting a closed space bonded; in the headset further acceleration sensor. For example, the acceleration sensor is provided in the headset does not contact the wearer's skin location.

Step S920, the when the headset is worn, collected by a microphone within the cavity by the pressure variation signal generated due to the body motion signal generated by the wearer acquired by the acceleration sensor;

Step S930, the acceleration sensor signal collected adaptive filtering process performed to obtain an estimated signal due to body motion of the wearer of the generated microphone signals collected.

Step S940, the signal acquired from the microphone to the estimate signal is subtracted, to obtain heart rate related signal;

Step S950, according to the heart rate detection signal related to the heart rate.

In one embodiment of the present invention, the method shown in FIG. 9 subtracting the estimated signal from the microphone to capture the signal, a signal related to the heart rate before getting further comprising: a microphone to collect low-pass filtering the signal to give low pass filtered signal. Then step S940 is subtracted from the microphone signals collected in the estimation signal, to obtain heart rate related signal comprises: subtracting the estimated signal from the low pass filtered signal to obtain a signal related to the heart rate.

In one embodiment of the present invention, step S930 in the acceleration sensor signal collected adaptive filtering process performed to obtain an estimated signal due to body motion of the wearer of the generated microphone signals acquired comprises:

Adaptive filtering of the estimated signal is obtained according to the adaptive filter parameters of the acceleration sensor signal collected.

In one embodiment of the present invention, step S950 includes detecting the heart rate based on a signal related to the heart rate: heart rate related signal cycle is detected, the heart rate obtained from the reciprocal of the period of the detected signal.

In summary, the present invention of FIG embodiment shown the beneficial effects of the embodiment 5-9 comprises:

(1) a smaller volume enclosed cavity to accommodate the microphone, ambient noise is reduced, and strengthening the information signal detected by the microphone.

(2) adding a headset acceleration sensor for acquiring a signal due to the movement produced by the human body, and to eliminate the effect of exercise on the human body by the heart rate detection adaptive filter design.

(3) According to the characteristic vibration frequency of the pulse, a low-pass filter is designed to further reduce the influence of external high frequency noise.

The above are only preferred embodiments of the present invention but are not intended to limit the scope of the present invention. Any modifications within the spirit and principle of the present invention, equivalent substitutions, improvements, etc., are included within the scope of the present invention.

Claims (14)

One kind of heart rate detection method applied to the headset, wherein the method comprises:

A cavity provided in the headset, the microphone is mounted within the cavity; said cavity opening and headphones shell bonding position, when the earpiece is attached to the human ear auricle bonded position of the earphone housing; headphones shell at the opening of the cavity with a hole bonded, when the headset is worn, and the ear cavity and the aperture bonded constitute a closed space;

When the headset is worn by the microphone signal acquired by the pressure changes within the cavity generated;

As the microphone signal acquired heart rate related signal;

Heart rate detection signal related to a heart rate.

The method according to claim 1, wherein the method further comprises: collecting the microphone signal is filtered to obtain a filtered signal;

The heart rate detection signal of the microphone comprising a collected: heart rate detected based on the filtered signal.

The method according to claim 1, wherein said method comprises:

In an acceleration sensor provided in the headset;

When the headset is worn, since the body motion signal generated by the wearer acquired by the acceleration sensor;

The acceleration sensor to capture a signal adaptive filtering process, to obtain an estimated signal due to body motion of the wearer of the generated microphone signals collected;

Collected from the microphone signal by subtracting the estimated signal to obtain a signal related to the heart rate.

The method according to claim 3, wherein,

Prior to subtracting the estimated signal from the microphone signals collected to obtain a signal related to the heart rate, the method further comprising: the microphone signal acquired low-pass filtering process, to obtain a low pass filtered signal;

The signals collected from the microphone to subtract the estimated signal, to obtain heart rate related signal comprises: subtracting said low pass filtered signal from said estimation signal to obtain a signal related to the heart rate.

The method according to the signal as claimed in claim 3, wherein the acceleration sensor is acquired to the adaptive filtering process is performed to obtain an estimated signal due to body motion of the wearer of the generated microphone signals acquired comprises :

The acceleration sensor according to the collected signals, and a predetermined heart rate related signal adaptive filtering algorithm adaptive parameters;

To obtain the estimated signal of the adaptive filter parameters of the acceleration sensor signal collected according to adaptive filtering.

The method according to claim 3, wherein the heart rate related according to the heart rate detection signal comprises:

Related to the periodic signal detecting heart rate;

By the reciprocal of the period of the detected signal obtained heart rate.

The method according to claim 3, wherein said acceleration sensor further comprises in headphones:

The acceleration sensor is provided in the headset does not contact the wearer's skin location.

One kind capable of detecting the heart rate earphone, wherein the earphone comprising: heart beat detecting means, disposed within the cavity and mounted on the headset microphone within the cavity;

Wherein the shell with a headset port bonded position of the cavity is, when the earpiece is attached to the human ear auricle engagement position earphone shell; headphones shell at the opening of the cavity with a hole bonded , when the headset is worn, and the ear cavity and the aperture bonded constitute a closed space;

The microphone, when the earpiece is used to collect the signal within the cavity by the pressure variation generated; the microphone signal acquired as a heart rate related signal;

The heart rate detection unit for detecting the heart rate of a heart rate related signal.

The earphone as claimed in claim 8, wherein the headset further comprises:

Filtering unit for the microphone signals collected by a filtering process, to obtain the filtered signal is output to the heart rate detection unit;

The earphone as claimed in claim 8, wherein the headset further comprises: an acceleration sensor, adaptive filtering means and subtraction means;

The acceleration sensor is used when the headset is worn, since the body motion signal acquisition wearer generated and outputted to the adaptive filtering means;

The adaptive filtering means for adaptively filtering a signal related to a heart rate of said acceleration sensor acquired signal to obtain an estimated signal due to body motion of the wearer of the generated microphone signals collected after the output to the subtraction unit;

The subtraction unit, for acquiring a signal from the microphone to subtracting the estimated signal to obtain an output signal related to the heart rate to a heart rate detecting means and said adaptive filtering means.

The earphone as claimed in claim 10, wherein the headset further comprises: a low pass filter for the microphone signal acquired low-pass filtering process, to obtain a low pass filtered signal and output to the subtraction unit;

The subtraction unit for subtracting the low pass filtered signal from said estimation signal to obtain an output signal related to the heart rate to a heart rate detecting means.

The adaptive parameter adjusting unit, for acquiring an acceleration sensor according to the signal, the signal and the preset adaptive algorithm to adjust the heart rate related to the filtering parameters tunable filter parameter;

The tunable filter parameters, to the subtraction unit for estimating signal due to body motion of the wearer produced by adaptive filtering, the output of the microphone signals collected on the signal of the acceleration sensor will be collected using the filter parameters .

The earphone as claimed in claim 10, wherein,

The heart rate detection unit, a signal period of the heart rate is detected correlation, the reciprocal of the period of the detected signal obtained heart rate.

The earphone as claimed in claim 10, wherein,

Said acceleration sensor is provided in the headset does not contact the wearer's skin location.